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Annotation of embedaddon/quagga/lib/network.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Network library.
        !             3:  * Copyright (C) 1997 Kunihiro Ishiguro
        !             4:  *
        !             5:  * This file is part of GNU Zebra.
        !             6:  *
        !             7:  * GNU Zebra is free software; you can redistribute it and/or modify it
        !             8:  * under the terms of the GNU General Public License as published by the
        !             9:  * Free Software Foundation; either version 2, or (at your option) any
        !            10:  * later version.
        !            11:  *
        !            12:  * GNU Zebra is distributed in the hope that it will be useful, but
        !            13:  * WITHOUT ANY WARRANTY; without even the implied warranty of
        !            14:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            15:  * General Public License for more details.
        !            16:  *
        !            17:  * You should have received a copy of the GNU General Public License
        !            18:  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
        !            19:  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
        !            20:  * 02111-1307, USA.  
        !            21:  */
        !            22: 
        !            23: #include <zebra.h>
        !            24: #include "log.h"
        !            25: #include "network.h"
        !            26: 
        !            27: /* Read nbytes from fd and store into ptr. */
        !            28: int
        !            29: readn (int fd, u_char *ptr, int nbytes)
        !            30: {
        !            31:   int nleft;
        !            32:   int nread;
        !            33: 
        !            34:   nleft = nbytes;
        !            35: 
        !            36:   while (nleft > 0) 
        !            37:     {
        !            38:       nread = read (fd, ptr, nleft);
        !            39: 
        !            40:       if (nread < 0) 
        !            41:        return (nread);
        !            42:       else
        !            43:        if (nread == 0) 
        !            44:          break;
        !            45: 
        !            46:       nleft -= nread;
        !            47:       ptr += nread;
        !            48:     }
        !            49: 
        !            50:   return nbytes - nleft;
        !            51: }  
        !            52: 
        !            53: /* Write nbytes from ptr to fd. */
        !            54: int
        !            55: writen(int fd, const u_char *ptr, int nbytes)
        !            56: {
        !            57:   int nleft;
        !            58:   int nwritten;
        !            59: 
        !            60:   nleft = nbytes;
        !            61: 
        !            62:   while (nleft > 0) 
        !            63:     {
        !            64:       nwritten = write(fd, ptr, nleft);
        !            65:       
        !            66:       if (nwritten <= 0) 
        !            67:        return (nwritten);
        !            68: 
        !            69:       nleft -= nwritten;
        !            70:       ptr += nwritten;
        !            71:     }
        !            72:   return nbytes - nleft;
        !            73: }
        !            74: 
        !            75: int
        !            76: set_nonblocking(int fd)
        !            77: {
        !            78:   int flags;
        !            79: 
        !            80:   /* According to the Single UNIX Spec, the return value for F_GETFL should
        !            81:      never be negative. */
        !            82:   if ((flags = fcntl(fd, F_GETFL)) < 0)
        !            83:     {
        !            84:       zlog_warn("fcntl(F_GETFL) failed for fd %d: %s",
        !            85:                fd, safe_strerror(errno));
        !            86:       return -1;
        !            87:     }
        !            88:   if (fcntl(fd, F_SETFL, (flags | O_NONBLOCK)) < 0)
        !            89:     {
        !            90:       zlog_warn("fcntl failed setting fd %d non-blocking: %s",
        !            91:                fd, safe_strerror(errno));
        !            92:       return -1;
        !            93:     }
        !            94:   return 0;
        !            95: }